Pneumatic-tire core.



H C. BROWN WILL PNE MATIC TIRE APPLICA ION FILED DEC. ,VI

Patented July 25, 1916.

HOWARD Cf. EROWN AND GEORGE WILLIAMS, 01E AKRON, OHIO, ASSIGNOES OF ONE-- THIRD '10 EDWARD MoSWEENEY.

PNEUMATICLTIRE cone.

Specification 03? Letters Patent.

Patented July 25, 1916.

Application filed December 3, 1913. Serial No. 804,449.

To all tukom it may concern:

Be it known that We, HowARn 0. BROWN I and Gnoncn WILLIAMS, citizens of the United States, residing at Akron, in the county of Summit and State of Ohio, have invented. new and useful Improvements in Pneumatic- Tire Cores, of which the following is a specification.

This invention relates'to means in collapsible or separable cores for use in manufacturing the outer-shoes of double tube pneumatic tires, the object of the invention eing to provide a simple and inexpensive construction of sectional core in which the core ring and mandrel are combined in a unitary structure, and which embodies simple and effective means for connecting the sections of the core together so that the side plates or rings and transverse fastening bolts usually employed may be dispensed with, the number of parts reduced and the construction materially simplified, rendered less expensive of manufacture and time and labor saved in setting up and collapsing the core.

The invention consists of the features of construction, combination and arrangement of parts herein fully described and ciaimed reference being had to the; accompanying drawing in which Figure 1 is a side elevation of a collapsible core embodying our invention, showing the core set up for use. Fig. 2-is a vertical transverse section on the line 2--2 of Fig. 1. Fig. 3 is a transverse section on the line 3-3 of Fi 2. Fig. 4 is a perspective view of one of t e fasteningwedges.

in carrying our invention into practice, we provide a core or mandrel with the usual flange 2.. The core may be made of any suitable number of sections. In the present instancewe have shown it as composed of three sections 3, i and 5, but any desired or suitable number of sections may be employed. The core may be suitably formed to produce any of the Well known types of tire shoes incommon use. In practice, we preferably employ a core consisting of three sections, and ma e the key section 3 relatively smaller than the other segmental sec tions 4 and 5, which are of equal size, thus enabling the parts to be more easily and conveniently handled.

The end faces of the respective core sections are adapted to abut and are provided with transverse recesses 6 and intersecting grooves 7. The recesses 6 of opposing faces form a Wedge-shape passage, and the grooves 7 of opposing faces are arranged to converge from one side to the opposite side of the core, as shown. adapted to be held connected by locking blocks 8, which blocks are adapted fkirfietr' gagement with the intersecting recesses 6 when the sections of the core are brought'together. The said blocks are Wedge-shape to fit dove-tailed passages formedby mating recesses to bring th meeting faees ...ot use core sections in such relation that the- .tie edges and peripheral portions of said sections will eiractly coincide. The block is provided upon one of its faces with ribs or protections 9 adapted to engage the groove The sections are i of opposing core sections, which ribs converge in accordance with the convergence of said grooves to draw the core sections snugly together, thus insuring their firm engagement. The reduced end of the block is provided with a threaded stemvor projection 10 which projects outwardly through the core beyond the restricted end of the passage formed by recesses 6 and is adapted for engagement by a washer 11 and nut 12 to retain the bloclrin position.

It will be seen from the foregoing description that the invention provides a core which comprises a minimum number of parts, which dispenses with the side rings and, bolts commonly empioyed, and the sec-1 tions of which may be quickly, conveniently and firmly fastened together by means of the wedge blocks thereby obviating the neforming wedgeshape passages and coacting pairs of diverging groovesinterseeting said In testimony whereof We afiix our signapassagas weqge-shape bloc ada gecg 110 2181 tures in presenceof two Witnesses.

lnserte 1n sai passages an PIOVI e W1 x convergent projections to engage said 5 grooves, the reduced'end of each block being provided with a threaded stem, and a nut Witnesses: adapted to engage the stem to hold theblock IRA L. NASH, in position. 1 WM. ROBISON. 

